View of two unidentified tractors side by side being tested for Belt Power during the Winnipeg, Manitoba trials of the early 20-th Century (1907-1913). Those were the first organized tractor evaluations on the American continent. Prony Brakes were...

"Winnipeg plowing Contests 1910-1912. Prony Brake Dynamometers." Two dynamometers in the foreground. Belts run from there to two tractors in the background. The tractor on the right is a Tractor carrying the name "RELIANCE" At this time we do...

Agricultural Engineering Students performing power tests on a steam engine. The structure standing on the right side of the tractor is a sppecial Prony Brake which engages the flywheel directly. The tests were performed on the "University farm"...

"Doing a belt test on a Twin City tractor." The tractor is tested with a "Prony Brake" dynamometer, which is a friction based type and very unstable in maintaining a constant load. This test was probable set up for a demonstration, because the much...